1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * This contain platform specific code for APM PPC460EX based Canyonlands 4 * board. 5 * 6 * Copyright (c) 2010, Applied Micro Circuits Corporation 7 * Author: Rupjyoti Sarmah <rsarmah@apm.com> 8 */ 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <asm/pci-bridge.h> 12 #include <asm/ppc4xx.h> 13 #include <asm/udbg.h> 14 #include <asm/uic.h> 15 #include <linux/of_address.h> 16 #include <linux/of_platform.h> 17 #include <linux/delay.h> 18 #include "44x.h" 19 20 #define BCSR_USB_EN 0x11 21 22 static const struct of_device_id ppc460ex_of_bus[] __initconst = { 23 { .compatible = "ibm,plb4", }, 24 { .compatible = "ibm,opb", }, 25 { .compatible = "ibm,ebc", }, 26 { .compatible = "simple-bus", }, 27 {}, 28 }; 29 30 static int __init ppc460ex_device_probe(void) 31 { 32 of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL); 33 34 return 0; 35 } 36 machine_device_initcall(canyonlands, ppc460ex_device_probe); 37 38 /* Using this code only for the Canyonlands board. */ 39 40 static int __init ppc460ex_probe(void) 41 { 42 pci_set_flags(PCI_REASSIGN_ALL_RSRC); 43 44 return 1; 45 } 46 47 /* USB PHY fixup code on Canyonlands kit. */ 48 49 static int __init ppc460ex_canyonlands_fixup(void) 50 { 51 u8 __iomem *bcsr ; 52 void __iomem *vaddr; 53 struct device_node *np; 54 int ret = 0; 55 56 np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr"); 57 if (!np) { 58 printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n"); 59 return -ENODEV; 60 } 61 62 bcsr = of_iomap(np, 0); 63 of_node_put(np); 64 65 if (!bcsr) { 66 printk(KERN_CRIT "Could not remap bcsr\n"); 67 ret = -ENODEV; 68 goto err_bcsr; 69 } 70 71 np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio"); 72 if (!np) { 73 printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n"); 74 return -ENODEV; 75 } 76 77 vaddr = of_iomap(np, 0); 78 of_node_put(np); 79 80 if (!vaddr) { 81 printk(KERN_CRIT "Could not get gpio node address\n"); 82 ret = -ENODEV; 83 goto err_gpio; 84 } 85 /* Disable USB, through the BCSR7 bits */ 86 setbits8(&bcsr[7], BCSR_USB_EN); 87 88 /* Wait for a while after reset */ 89 msleep(100); 90 91 /* Enable USB here */ 92 clrbits8(&bcsr[7], BCSR_USB_EN); 93 94 /* 95 * Configure multiplexed gpio16 and gpio19 as alternate1 output 96 * source after USB reset. In this configuration gpio16 will be 97 * USB2HStop and gpio19 will be USB2DStop. For more details refer to 98 * table 34-7 of PPC460EX user manual. 99 */ 100 setbits32((vaddr + GPIO0_OSRH), 0x42000000); 101 setbits32((vaddr + GPIO0_TSRH), 0x42000000); 102 err_gpio: 103 iounmap(vaddr); 104 err_bcsr: 105 iounmap(bcsr); 106 return ret; 107 } 108 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup); 109 define_machine(canyonlands) { 110 .name = "Canyonlands", 111 .compatible = "amcc,canyonlands", 112 .probe = ppc460ex_probe, 113 .progress = udbg_progress, 114 .init_IRQ = uic_init_tree, 115 .get_irq = uic_get_irq, 116 .restart = ppc4xx_reset_system, 117 }; 118